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1. (WO2000064114) ECHO CANCELLATION AND CHANNEL EQUALIZATION FOR DIGITAL TRANSMISSION

Pub. No.:    WO/2000/064114    International Application No.:    PCT/EP2000/003340
Publication Date: Oct 26, 2000 International Filing Date: Apr 13, 2000
IPC: H04L 25/02
H04N 21/2383
H04N 21/438
Applicants: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Inventors: KOO, David, D.
Title: ECHO CANCELLATION AND CHANNEL EQUALIZATION FOR DIGITAL TRANSMISSION
Abstract:
A method for determining and reducing or eliminating mid-range and long-range echoes in the digital data transmission (in ATSC VSB system) is described. A portion of an ATSC VSB television signal is separated from the rest of the signal, certain values are set to zero and it is correlated with a first vector of data. The result of the correlation represents a channel model as affected by echoes within the channel, and then a second vector of data is added to it to derive correction information useful in positioning moveable filter taps to suppress the most prominent echoes.